<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <cpn :number1="num1" :number2="num2" @num1changed="num1Changed" @num2changed="num2Changed"></cpn>
    </div>

    <template id="cpn">
        <div>
            <h2>props:{{number1}}</h2>
            <h2>data:{{dnumber1}}</h2>
            <!-- <input type="text" v-model="number1"> -->
            <input type="text" :value="dnumber1" @input="num1Input">
            <h2>props:{{number2}}</h2>
            <h2>data:{{dnumber2}}</h2>
            <!-- <input type="text" v-model="number2"> -->
            <input type="text" :value="dnumber2" @input="num2Input">
        </div>
    </template>

    <script src="../js/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                num1: 1,
                num2: 0
            },
            components: {
                cpn: {
                    template: '#cpn',
                    props: {
                        number1: Number,
                        number2: Number
                    },
                    data(){
                        return {
                            dnumber1 : this.number1,
                            dnumber2 : this.number2
                        }
                    },
                    methods:{
                        num1Input(event){
                            // 1.将input中的value赋值到dnumber1中
                            this.dnumber1 = event.target.value;
                            // 2.为了让父组件可以修改值，发出一个事件
                            this.$emit('num1changed',this.dnumber1);
                            // 3.修改dnumber2的值
                            this.dnumber2 = this.dnumber1 * 100;
                            this.$emit("num2changed",this.dnumber2);
                        },
                        num2Input(event){
                            this.dnumber2 = event.target.value;
                            this.$emit('num2changed',this.dnumber2);
                        }
                    }
                }
            },
            methods:{
                num1Changed(value){
                    console.log(typeof value);
                    this.num1 = parseFloat(value);
                },
                num2Changed(value){
                    console.log(typeof value);
                    this.num2 = parseFloat(value);
                }
            }
        })
    </script>

</body>

</html>